/**
 * qrcode
 * @param typeNumber 1 to 40
 * @param errorCorrectLevel 'L','M','Q','H'
 */
 var qrcode = function(typeNumber, errorCorrectLevel) {

  var PAD0 = 0xEC;
  var PAD1 = 0x11;

  var _typeNumber = typeNumber;
  var _errorCorrectLevel = QRErrorCorrectLevel[errorCorrectLevel];
  var _modules = null;
  var _moduleCount = 0;
  var _dataCache = null;
  var _dataList = new Array();

  var _this = {};

  var makeImpl = function(test, maskPattern) {

_moduleCount = _typeNumber * 4 + 17;
_modules = function(moduleCount) {
    var modules = new Array(moduleCount);
    for (var row = 0; row < moduleCount; row += 1) {
  modules[row] = new Array(moduleCount);
  for (var col = 0; col < moduleCount; col += 1) {
      modules[row][col] = null;
  }
    }
    return modules;
}(_moduleCount);

setupPositionProbePattern(0, 0);
setupPositionProbePattern(_moduleCount - 7, 0);
setupPositionProbePattern(0, _moduleCount - 7);
setupPositionAdjustPattern();
setupTimingPattern();
setupTypeInfo(test, maskPattern);

if (_typeNumber >= 7) {
    setupTypeNumber(test);
}

if (_dataCache == null) {
    _dataCache = createData(_typeNumber, _errorCorrectLevel, _dataList);
}

mapData(_dataCache, maskPattern);
  };

  var setupPositionProbePattern = function(row, col) {

for (var r = -1; r <= 7; r += 1) {

    if (row + r <= -1 || _moduleCount <= row + r) continue;

    for (var c = -1; c <= 7; c += 1) {

  if (col + c <= -1 || _moduleCount <= col + c) continue;

  if ( (0 <= r && r <= 6 && (c == 0 || c == 6) )
       || (0 <= c && c <= 6 && (r == 0 || r == 6) )
       || (2 <= r && r <= 4 && 2 <= c && c <= 4) ) {
      _modules[row + r][col + c] = true;
  } else {
      _modules[row + r][col + c] = false;
  }
    }
}
  };

  var getBestMaskPattern = function() {

var minLostPoint = 0;
var pattern = 0;

for (var i = 0; i < 8; i += 1) {

    makeImpl(true, i);

    var lostPoint = QRUtil.getLostPoint(_this);

    if (i == 0 || minLostPoint > lostPoint) {
  minLostPoint = lostPoint;
  pattern = i;
    }
}

return pattern;
  };

  var setupTimingPattern = function() {

for (var r = 8; r < _moduleCount - 8; r += 1) {
    if (_modules[r][6] != null) {
  continue;
    }
    _modules[r][6] = (r % 2 == 0);
}

for (var c = 8; c < _moduleCount - 8; c += 1) {
    if (_modules[6][c] != null) {
  continue;
    }
    _modules[6][c] = (c % 2 == 0);
}
  };

  var setupPositionAdjustPattern = function() {

var pos = QRUtil.getPatternPosition(_typeNumber);

for (var i = 0; i < pos.length; i += 1) {

    for (var j = 0; j < pos.length; j += 1) {

  var row = pos[i];
  var col = pos[j];

  if (_modules[row][col] != null) {
      continue;
  }

  for (var r = -2; r <= 2; r += 1) {

      for (var c = -2; c <= 2; c += 1) {

    if (r == -2 || r == 2 || c == -2 || c == 2
        || (r == 0 && c == 0) ) {
        _modules[row + r][col + c] = true;
    } else {
        _modules[row + r][col + c] = false;
    }
      }
  }
    }
}
  };

  var setupTypeNumber = function(test) {

var bits = QRUtil.getBCHTypeNumber(_typeNumber);

for (var i = 0; i < 18; i += 1) {
    var mod = (!test && ( (bits >> i) & 1) == 1);
    _modules[Math.floor(i / 3)][i % 3 + _moduleCount - 8 - 3] = mod;
}

for (var i = 0; i < 18; i += 1) {
    var mod = (!test && ( (bits >> i) & 1) == 1);
    _modules[i % 3 + _moduleCount - 8 - 3][Math.floor(i / 3)] = mod;
}
  };

  var setupTypeInfo = function(test, maskPattern) {

var data = (_errorCorrectLevel << 3) | maskPattern;
var bits = QRUtil.getBCHTypeInfo(data);

// vertical
for (var i = 0; i < 15; i += 1) {

    var mod = (!test && ( (bits >> i) & 1) == 1);

    if (i < 6) {
  _modules[i][8] = mod;
    } else if (i < 8) {
  _modules[i + 1][8] = mod;
    } else {
  _modules[_moduleCount - 15 + i][8] = mod;
    }
}

// horizontal
for (var i = 0; i < 15; i += 1) {

    var mod = (!test && ( (bits >> i) & 1) == 1);

    if (i < 8) {
  _modules[8][_moduleCount - i - 1] = mod;
    } else if (i < 9) {
  _modules[8][15 - i - 1 + 1] = mod;
    } else {
  _modules[8][15 - i - 1] = mod;
    }
}

// fixed module
_modules[_moduleCount - 8][8] = (!test);
  };

  var mapData = function(data, maskPattern) {

var inc = -1;
var row = _moduleCount - 1;
var bitIndex = 7;
var byteIndex = 0;
var maskFunc = QRUtil.getMaskFunction(maskPattern);

for (var col = _moduleCount - 1; col > 0; col -= 2) {

    if (col == 6) col -= 1;

    while (true) {

  for (var c = 0; c < 2; c += 1) {

      if (_modules[row][col - c] == null) {

    var dark = false;

    if (byteIndex < data.length) {
        dark = ( ( (data[byteIndex] >>> bitIndex) & 1) == 1);
    }

    var mask = maskFunc(row, col - c);

    if (mask) {
        dark = !dark;
    }

    _modules[row][col - c] = dark;
    bitIndex -= 1;

    if (bitIndex == -1) {
        byteIndex += 1;
        bitIndex = 7;
    }
      }
  }

  row += inc;

  if (row < 0 || _moduleCount <= row) {
      row -= inc;
      inc = -inc;
      break;
  }
    }
}
  };

  var createBytes = function(buffer, rsBlocks) {

var offset = 0;

var maxDcCount = 0;
var maxEcCount = 0;

var dcdata = new Array(rsBlocks.length);
var ecdata = new Array(rsBlocks.length);

for (var r = 0; r < rsBlocks.length; r += 1) {

    var dcCount = rsBlocks[r].dataCount;
    var ecCount = rsBlocks[r].totalCount - dcCount;

    maxDcCount = Math.max(maxDcCount, dcCount);
    maxEcCount = Math.max(maxEcCount, ecCount);

    dcdata[r] = new Array(dcCount);

    for (var i = 0; i < dcdata[r].length; i += 1) {
  dcdata[r][i] = 0xff & buffer.getBuffer()[i + offset];
    }
    offset += dcCount;

    var rsPoly = QRUtil.getErrorCorrectPolynomial(ecCount);
    var rawPoly = qrPolynomial(dcdata[r], rsPoly.getLength() - 1);

    var modPoly = rawPoly.mod(rsPoly);
    ecdata[r] = new Array(rsPoly.getLength() - 1);
    for (var i = 0; i < ecdata[r].length; i += 1) {
  var modIndex = i + modPoly.getLength() - ecdata[r].length;
  ecdata[r][i] = (modIndex >= 0)? modPoly.getAt(modIndex) : 0;
    }
}

var totalCodeCount = 0;
for (var i = 0; i < rsBlocks.length; i += 1) {
    totalCodeCount += rsBlocks[i].totalCount;
}

var data = new Array(totalCodeCount);
var index = 0;

for (var i = 0; i < maxDcCount; i += 1) {
    for (var r = 0; r < rsBlocks.length; r += 1) {
  if (i < dcdata[r].length) {
      data[index] = dcdata[r][i];
      index += 1;
  }
    }
}

for (var i = 0; i < maxEcCount; i += 1) {
    for (var r = 0; r < rsBlocks.length; r += 1) {
  if (i < ecdata[r].length) {
      data[index] = ecdata[r][i];
      index += 1;
  }
    }
}

return data;
  };

  var createData = function(typeNumber, errorCorrectLevel, dataList) {

var rsBlocks = QRRSBlock.getRSBlocks(typeNumber, errorCorrectLevel);

var buffer = qrBitBuffer();

for (var i = 0; i < dataList.length; i += 1) {
    var data = dataList[i];
    buffer.put(data.getMode(), 4);
    buffer.put(data.getLength(), QRUtil.getLengthInBits(data.getMode(), typeNumber) );
    data.write(buffer);
}

// calc num max data.
var totalDataCount = 0;
for (var i = 0; i < rsBlocks.length; i += 1) {
    totalDataCount += rsBlocks[i].dataCount;
}

if (buffer.getLengthInBits() > totalDataCount * 8) {
    throw new Error('code length overflow. ('
        + buffer.getLengthInBits()
        + '>'
        + totalDataCount * 8
        + ')');
}

// end code
if (buffer.getLengthInBits() + 4 <= totalDataCount * 8) {
    buffer.put(0, 4);
}

// padding
while (buffer.getLengthInBits() % 8 != 0) {
    buffer.putBit(false);
}

// padding
while (true) {

    if (buffer.getLengthInBits() >= totalDataCount * 8) {
  break;
    }
    buffer.put(PAD0, 8);

    if (buffer.getLengthInBits() >= totalDataCount * 8) {
  break;
    }
    buffer.put(PAD1, 8);
}

return createBytes(buffer, rsBlocks);
  };

  _this.addData = function(data) {
var newData = qr8BitByte(data);
_dataList.push(newData);
_dataCache = null;
  };

  _this.isDark = function(row, col) {
if (row < 0 || _moduleCount <= row || col < 0 || _moduleCount <= col) {
    throw new Error(row + ',' + col);
}
return _modules[row][col];
  };

  _this.getModuleCount = function() {
return _moduleCount;
  };

  _this.make = function() {
makeImpl(false, getBestMaskPattern() );
  };

  _this.createTableTag = function(cellSize, margin) {

cellSize = cellSize || 2;
margin = (typeof margin == 'undefined')? cellSize * 4 : margin;

var qrHtml = '';

qrHtml += '<table style="';
qrHtml += ' border-width: 0px; border-style: none;';
qrHtml += ' border-collapse: collapse;';
qrHtml += ' padding: 0px; margin: ' + margin + 'px;';
qrHtml += '">';
qrHtml += '<tbody>';

for (var r = 0; r < _this.getModuleCount(); r += 1) {

    qrHtml += '<tr>';

    for (var c = 0; c < _this.getModuleCount(); c += 1) {
  qrHtml += '<td style="';
  qrHtml += ' border-width: 0px; border-style: none;';
  qrHtml += ' border-collapse: collapse;';
  qrHtml += ' padding: 0px; margin: 0px;';
  qrHtml += ' width: ' + cellSize + 'px;';
  qrHtml += ' height: ' + cellSize + 'px;';
  qrHtml += ' background-color: ';
  qrHtml += _this.isDark(r, c)? '#000000' : '#ffffff';
  qrHtml += ';';
  qrHtml += '"/>';
    }

    qrHtml += '</tr>';
}

qrHtml += '</tbody>';
qrHtml += '</table>';

return qrHtml;
  };

  _this.createImgTag = function(cellSize, margin, size) {

cellSize = cellSize || 2;
margin = (typeof margin == 'undefined')? cellSize * 4 : margin;

var min = margin;
var max = _this.getModuleCount() * cellSize + margin;

return createImgTag(size, size, function(x, y) {
    if (min <= x && x < max && min <= y && y < max) {
  var c = Math.floor( (x - min) / cellSize);
  var r = Math.floor( (y - min) / cellSize);
  return _this.isDark(r, c)? 0 : 1;
    } else {
  return 1;
    }
} );
  };

  return _this;
};

//---------------------------------------------------------------------
// qrcode.stringToBytes
//---------------------------------------------------------------------

qrcode.stringToBytes = function(s) {
  var bytes = new Array();
  for (var i = 0; i < s.length; i += 1) {
var c = s.charCodeAt(i);
bytes.push(c & 0xff);
  }
  return bytes;
};

//---------------------------------------------------------------------
// qrcode.createStringToBytes
//---------------------------------------------------------------------

/**
* @param unicodeData base64 string of byte array.
* [16bit Unicode],[16bit Bytes], ...
* @param numChars
*/
qrcode.createStringToBytes = function(unicodeData, numChars) {

  // create conversion map.

  var unicodeMap = function() {

var bin = base64DecodeInputStream(unicodeData);
var read = function() {
    var b = bin.read();
    if (b == -1) throw new Error();
    return b;
};

var count = 0;
var unicodeMap = {};
while (true) {
    var b0 = bin.read();
    if (b0 == -1) break;
    var b1 = read();
    var b2 = read();
    var b3 = read();
    var k = String.fromCharCode( (b0 << 8) | b1);
    var v = (b2 << 8) | b3;
    unicodeMap[k] = v;
    count += 1;
}
if (count != numChars) {
    throw new Error(count + ' != ' + numChars);
}

return unicodeMap;
  }();

  var unknownChar = '?'.charCodeAt(0);

  return function(s) {
var bytes = new Array();
for (var i = 0; i < s.length; i += 1) {
    var c = s.charCodeAt(i);
    if (c < 128) {
  bytes.push(c);
    } else {
  var b = unicodeMap[s.charAt(i)];
  if (typeof b == 'number') {
      if ( (b & 0xff) == b) {
    // 1byte
    bytes.push(b);
      } else {
    // 2bytes
    bytes.push(b >>> 8);
    bytes.push(b & 0xff);
      }
  } else {
      bytes.push(unknownChar);
  }
    }
}
return bytes;
  };
};

//---------------------------------------------------------------------
// QRMode
//---------------------------------------------------------------------

var QRMode = {
  MODE_NUMBER :		1 << 0,
  MODE_ALPHA_NUM : 	1 << 1,
  MODE_8BIT_BYTE : 	1 << 2,
  MODE_KANJI :		1 << 3
};

//---------------------------------------------------------------------
// QRErrorCorrectLevel
//---------------------------------------------------------------------

var QRErrorCorrectLevel = {
  L : 1,
  M : 0,
  Q : 3,
  H : 2
};

//---------------------------------------------------------------------
// QRMaskPattern
//---------------------------------------------------------------------

var QRMaskPattern = {
  PATTERN000 : 0,
  PATTERN001 : 1,
  PATTERN010 : 2,
  PATTERN011 : 3,
  PATTERN100 : 4,
  PATTERN101 : 5,
  PATTERN110 : 6,
  PATTERN111 : 7
};

//---------------------------------------------------------------------
// QRUtil
//---------------------------------------------------------------------

var QRUtil = function() {

  var PATTERN_POSITION_TABLE = [
[],
[6, 18],
[6, 22],
[6, 26],
[6, 30],
[6, 34],
[6, 22, 38],
[6, 24, 42],
[6, 26, 46],
[6, 28, 50],
[6, 30, 54],
[6, 32, 58],
[6, 34, 62],
[6, 26, 46, 66],
[6, 26, 48, 70],
[6, 26, 50, 74],
[6, 30, 54, 78],
[6, 30, 56, 82],
[6, 30, 58, 86],
[6, 34, 62, 90],
[6, 28, 50, 72, 94],
[6, 26, 50, 74, 98],
[6, 30, 54, 78, 102],
[6, 28, 54, 80, 106],
[6, 32, 58, 84, 110],
[6, 30, 58, 86, 114],
[6, 34, 62, 90, 118],
[6, 26, 50, 74, 98, 122],
[6, 30, 54, 78, 102, 126],
[6, 26, 52, 78, 104, 130],
[6, 30, 56, 82, 108, 134],
[6, 34, 60, 86, 112, 138],
[6, 30, 58, 86, 114, 142],
[6, 34, 62, 90, 118, 146],
[6, 30, 54, 78, 102, 126, 150],
[6, 24, 50, 76, 102, 128, 154],
[6, 28, 54, 80, 106, 132, 158],
[6, 32, 58, 84, 110, 136, 162],
[6, 26, 54, 82, 110, 138, 166],
[6, 30, 58, 86, 114, 142, 170]
  ];
  var G15 = (1 << 10) | (1 << 8) | (1 << 5) | (1 << 4) | (1 << 2) | (1 << 1) | (1 << 0);
  var G18 = (1 << 12) | (1 << 11) | (1 << 10) | (1 << 9) | (1 << 8) | (1 << 5) | (1 << 2) | (1 << 0);
  var G15_MASK = (1 << 14) | (1 << 12) | (1 << 10) | (1 << 4) | (1 << 1);

  var _this = {};

  var getBCHDigit = function(data) {
var digit = 0;
while (data != 0) {
    digit += 1;
    data >>>= 1;
}
return digit;
  };

  _this.getBCHTypeInfo = function(data) {
var d = data << 10;
while (getBCHDigit(d) - getBCHDigit(G15) >= 0) {
    d ^= (G15 << (getBCHDigit(d) - getBCHDigit(G15) ) );
}
return ( (data << 10) | d) ^ G15_MASK;
  };

  _this.getBCHTypeNumber = function(data) {
var d = data << 12;
while (getBCHDigit(d) - getBCHDigit(G18) >= 0) {
    d ^= (G18 << (getBCHDigit(d) - getBCHDigit(G18) ) );
}
return (data << 12) | d;
  };

  _this.getPatternPosition = function(typeNumber) {
return PATTERN_POSITION_TABLE[typeNumber - 1];
  };

  _this.getMaskFunction = function(maskPattern) {

switch (maskPattern) {

    case QRMaskPattern.PATTERN000 :
  return function(i, j) { return (i + j) % 2 == 0; };
    case QRMaskPattern.PATTERN001 :
  return function(i, j) { return i % 2 == 0; };
    case QRMaskPattern.PATTERN010 :
  return function(i, j) { return j % 3 == 0; };
    case QRMaskPattern.PATTERN011 :
  return function(i, j) { return (i + j) % 3 == 0; };
    case QRMaskPattern.PATTERN100 :
  return function(i, j) { return (Math.floor(i / 2) + Math.floor(j / 3) ) % 2 == 0; };
    case QRMaskPattern.PATTERN101 :
  return function(i, j) { return (i * j) % 2 + (i * j) % 3 == 0; };
    case QRMaskPattern.PATTERN110 :
  return function(i, j) { return ( (i * j) % 2 + (i * j) % 3) % 2 == 0; };
    case QRMaskPattern.PATTERN111 :
  return function(i, j) { return ( (i * j) % 3 + (i + j) % 2) % 2 == 0; };

  default :
  throw new Error('bad maskPattern:' + maskPattern);
}
  };

  _this.getErrorCorrectPolynomial = function(errorCorrectLength) {
var a = qrPolynomial([1], 0);
for (var i = 0; i < errorCorrectLength; i += 1) {
    a = a.multiply(qrPolynomial([1, QRMath.gexp(i)], 0) );
}
return a;
  };

  _this.getLengthInBits = function(mode, type) {

if (1 <= type && type < 10) {

    // 1 - 9

    switch(mode) {
  case QRMode.MODE_NUMBER 	: return 10;
  case QRMode.MODE_ALPHA_NUM 	: return 9;
  case QRMode.MODE_8BIT_BYTE	: return 8;
  case QRMode.MODE_KANJI		: return 8;
      default :
      throw new Error('mode:' + mode);
    }

} else if (type < 27) {

    // 10 - 26

    switch(mode) {
  case QRMode.MODE_NUMBER 	: return 12;
  case QRMode.MODE_ALPHA_NUM 	: return 11;
  case QRMode.MODE_8BIT_BYTE	: return 16;
  case QRMode.MODE_KANJI		: return 10;
      default :
      throw new Error('mode:' + mode);
    }

} else if (type < 41) {

    // 27 - 40

    switch(mode) {
  case QRMode.MODE_NUMBER 	: return 14;
  case QRMode.MODE_ALPHA_NUM	: return 13;
  case QRMode.MODE_8BIT_BYTE	: return 16;
  case QRMode.MODE_KANJI		: return 12;
      default :
      throw new Error('mode:' + mode);
    }

} else {
    throw new Error('type:' + type);
}
  };

  _this.getLostPoint = function(qrcode) {

var moduleCount = qrcode.getModuleCount();

var lostPoint = 0;

// LEVEL1

for (var row = 0; row < moduleCount; row += 1) {
    for (var col = 0; col < moduleCount; col += 1) {

  var sameCount = 0;
  var dark = qrcode.isDark(row, col);

  for (var r = -1; r <= 1; r += 1) {

      if (row + r < 0 || moduleCount <= row + r) {
    continue;
      }

      for (var c = -1; c <= 1; c += 1) {

    if (col + c < 0 || moduleCount <= col + c) {
        continue;
    }

    if (r == 0 && c == 0) {
        continue;
    }

    if (dark == qrcode.isDark(row + r, col + c) ) {
        sameCount += 1;
    }
      }
  }

  if (sameCount > 5) {
      lostPoint += (3 + sameCount - 5);
  }
    }
};

// LEVEL2

for (var row = 0; row < moduleCount - 1; row += 1) {
    for (var col = 0; col < moduleCount - 1; col += 1) {
  var count = 0;
  if (qrcode.isDark(row, col) ) count += 1;
  if (qrcode.isDark(row + 1, col) ) count += 1;
  if (qrcode.isDark(row, col + 1) ) count += 1;
  if (qrcode.isDark(row + 1, col + 1) ) count += 1;
  if (count == 0 || count == 4) {
      lostPoint += 3;
  }
    }
}

// LEVEL3

for (var row = 0; row < moduleCount; row += 1) {
    for (var col = 0; col < moduleCount - 6; col += 1) {
  if (qrcode.isDark(row, col)
      && !qrcode.isDark(row, col + 1)
      &&  qrcode.isDark(row, col + 2)
      &&  qrcode.isDark(row, col + 3)
      &&  qrcode.isDark(row, col + 4)
      && !qrcode.isDark(row, col + 5)
      &&  qrcode.isDark(row, col + 6) ) {
      lostPoint += 40;
  }
    }
}

for (var col = 0; col < moduleCount; col += 1) {
    for (var row = 0; row < moduleCount - 6; row += 1) {
  if (qrcode.isDark(row, col)
      && !qrcode.isDark(row + 1, col)
      &&  qrcode.isDark(row + 2, col)
      &&  qrcode.isDark(row + 3, col)
      &&  qrcode.isDark(row + 4, col)
      && !qrcode.isDark(row + 5, col)
      &&  qrcode.isDark(row + 6, col) ) {
      lostPoint += 40;
  }
    }
}

// LEVEL4

var darkCount = 0;

for (var col = 0; col < moduleCount; col += 1) {
    for (var row = 0; row < moduleCount; row += 1) {
  if (qrcode.isDark(row, col) ) {
      darkCount += 1;
  }
    }
}

var ratio = Math.abs(100 * darkCount / moduleCount / moduleCount - 50) / 5;
lostPoint += ratio * 10;

return lostPoint;
  };

  return _this;
}();

//---------------------------------------------------------------------
// QRMath
//---------------------------------------------------------------------

var QRMath = function() {

  var EXP_TABLE = new Array(256);
  var LOG_TABLE = new Array(256);

  // initialize tables
  for (var i = 0; i < 8; i += 1) {
EXP_TABLE[i] = 1 << i;
  }
  for (var i = 8; i < 256; i += 1) {
EXP_TABLE[i] = EXP_TABLE[i - 4]
    ^ EXP_TABLE[i - 5]
    ^ EXP_TABLE[i - 6]
    ^ EXP_TABLE[i - 8];
  }
  for (var i = 0; i < 255; i += 1) {
LOG_TABLE[EXP_TABLE[i] ] = i;
  }

  var _this = {};

  _this.glog = function(n) {

if (n < 1) {
    throw new Error('glog(' + n + ')');
}

return LOG_TABLE[n];
  };

  _this.gexp = function(n) {

while (n < 0) {
    n += 255;
}

while (n >= 256) {
    n -= 255;
}

return EXP_TABLE[n];
  };

  return _this;
}();

//---------------------------------------------------------------------
// qrPolynomial
//---------------------------------------------------------------------

function qrPolynomial(num, shift) {

  if (typeof num.length == 'undefined') {
throw new Error(num.length + '/' + shift);
  }

  var _num = function() {
var offset = 0;
while (offset < num.length && num[offset] == 0) {
    offset += 1;
}
var _num = new Array(num.length - offset + shift);
for (var i = 0; i < num.length - offset; i += 1) {
    _num[i] = num[i + offset];
}
return _num;
  }();

  var _this = {};

  _this.getAt = function(index) {
return _num[index];
  };

  _this.getLength = function() {
return _num.length;
  };

  _this.multiply = function(e) {

var num = new Array(_this.getLength() + e.getLength() - 1);

for (var i = 0; i < _this.getLength(); i += 1) {
    for (var j = 0; j < e.getLength(); j += 1) {
  num[i + j] ^= QRMath.gexp(QRMath.glog(_this.getAt(i) ) + QRMath.glog(e.getAt(j) ) );
    }
}

return qrPolynomial(num, 0);
  };

  _this.mod = function(e) {

if (_this.getLength() - e.getLength() < 0) {
    return _this;
}

var ratio = QRMath.glog(_this.getAt(0) ) - QRMath.glog(e.getAt(0) );

var num = new Array(_this.getLength() );
for (var i = 0; i < _this.getLength(); i += 1) {
    num[i] = _this.getAt(i);
}

for (var i = 0; i < e.getLength(); i += 1) {
    num[i] ^= QRMath.gexp(QRMath.glog(e.getAt(i) ) + ratio);
}

// recursive call
return qrPolynomial(num, 0).mod(e);
  };

  return _this;
};

//---------------------------------------------------------------------
// QRRSBlock
//---------------------------------------------------------------------

var QRRSBlock = function() {


  // [1: [L, M, Q, H], ..]
  var RS_BLOCK_TABLE=[[1,26,19],[1,26,16],[1,26,13],[1,26,9],[1,44,34],[1,44,28],[1,44,22],[1,44,16],[1,70,55],[1,70,44],[2,35,17],[2,35,13],[1,100,80],[2,50,32],[2,50,24],[4,25,9],[1,134,108],[2,67,43],[2,33,15,2,34,16],[2,33,11,2,34,12],[2,86,68],[4,43,27],[4,43,19],[4,43,15],[2,98,78],[4,49,31],[2,32,14,4,33,15],[4,39,13,1,40,14],[2,121,97],[2,60,38,2,61,39],[4,40,18,2,41,19],[4,40,14,2,41,15],[2,146,116],[3,58,36,2,59,37],[4,36,16,4,37,17],[4,36,12,4,37,13],[2,86,68,2,87,69],[4,69,43,1,70,44],[6,43,19,2,44,20],[6,43,15,2,44,16],[4,101,81],[1,80,50,4,81,51],[4,50,22,4,51,23],[3,36,12,8,37,13],[2,116,92,2,117,93],[6,58,36,2,59,37],[4,46,20,6,47,21],[7,42,14,4,43,15],[4,133,107],[8,59,37,1,60,38],[8,44,20,4,45,21],[12,33,11,4,34,12],[3,145,115,1,146,116],[4,64,40,5,65,41],[11,36,16,5,37,17],[11,36,12,5,37,13],[5,109,87,1,110,88],[5,65,41,5,66,42],[5,54,24,7,55,25],[11,36,12],[5,122,98,1,123,99],[7,73,45,3,74,46],[15,43,19,2,44,20],[3,45,15,13,46,16],[1,135,107,5,136,108],[10,74,46,1,75,47],[1,50,22,15,51,23],[2,42,14,17,43,15],[5,150,120,1,151,121],[9,69,43,4,70,44],[17,50,22,1,51,23],[2,42,14,19,43,15],[3,141,113,4,142,114],[3,70,44,11,71,45],[17,47,21,4,48,22],[9,39,13,16,40,14],[3,135,107,5,136,108],[3,67,41,13,68,42],[15,54,24,5,55,25],[15,43,15,10,44,16],[4,144,116,4,145,117],[17,68,42],[17,50,22,6,51,23],[19,46,16,6,47,17],[2,139,111,7,140,112],[17,74,46],[7,54,24,16,55,25],[34,37,13],[4,151,121,5,152,122],[4,75,47,14,76,48],[11,54,24,14,55,25],[16,45,15,14,46,16],[6,147,117,4,148,118],[6,73,45,14,74,46],[11,54,24,16,55,25],[30,46,16,2,47,17],[8,132,106,4,133,107],[8,75,47,13,76,48],[7,54,24,22,55,25],[22,45,15,13,46,16],[10,142,114,2,143,115],[19,74,46,4,75,47],[28,50,22,6,51,23],[33,46,16,4,47,17],[8,152,122,4,153,123],[22,73,45,3,74,46],[8,53,23,26,54,24],[12,45,15,28,46,16],[3,147,117,10,148,118],[3,73,45,23,74,46],[4,54,24,31,55,25],[11,45,15,31,46,16],[7,146,116,7,147,117],[21,73,45,7,74,46],[1,53,23,37,54,24],[19,45,15,26,46,16],[5,145,115,10,146,116],[19,75,47,10,76,48],[15,54,24,25,55,25],[23,45,15,25,46,16],[13,145,115,3,146,116],[2,74,46,29,75,47],[42,54,24,1,55,25],[23,45,15,28,46,16],[17,145,115],[10,74,46,23,75,47],[10,54,24,35,55,25],[19,45,15,35,46,16],[17,145,115,1,146,116],[14,74,46,21,75,47],[29,54,24,19,55,25],[11,45,15,46,46,16],[13,145,115,6,146,116],[14,74,46,23,75,47],[44,54,24,7,55,25],[59,46,16,1,47,17],[12,151,121,7,152,122],[12,75,47,26,76,48],[39,54,24,14,55,25],[22,45,15,41,46,16],[6,151,121,14,152,122],[6,75,47,34,76,48],[46,54,24,10,55,25],[2,45,15,64,46,16],[17,152,122,4,153,123],[29,74,46,14,75,47],[49,54,24,10,55,25],[24,45,15,46,46,16],[4,152,122,18,153,123],[13,74,46,32,75,47],[48,54,24,14,55,25],[42,45,15,32,46,16],[20,147,117,4,148,118],[40,75,47,7,76,48],[43,54,24,22,55,25],[10,45,15,67,46,16],[19,148,118,6,149,119],[18,75,47,31,76,48],[34,54,24,34,55,25],[20,45,15,61,46,16]];

  var qrRSBlock = function(totalCount, dataCount) {
var _this = {};
_this.totalCount = totalCount;
_this.dataCount = dataCount;
return _this;
  };

  var _this = {};

  var getRsBlockTable = function(typeNumber, errorCorrectLevel) {

switch(errorCorrectLevel) {
    case QRErrorCorrectLevel.L :
  return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 0];
    case QRErrorCorrectLevel.M :
  return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 1];
    case QRErrorCorrectLevel.Q :
  return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 2];
    case QRErrorCorrectLevel.H :
  return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 3];
  default :
  return undefined;
}
  };

  _this.getRSBlocks = function(typeNumber, errorCorrectLevel) {

var rsBlock = getRsBlockTable(typeNumber, errorCorrectLevel);

if (typeof rsBlock == 'undefined') {
    throw new Error('bad rs block @ typeNumber:' + typeNumber +
        '/errorCorrectLevel:' + errorCorrectLevel);
}

var length = rsBlock.length / 3;

var list = new Array();

for (var i = 0; i < length; i += 1) {

    var count = rsBlock[i * 3 + 0];
    var totalCount = rsBlock[i * 3 + 1];
    var dataCount = rsBlock[i * 3 + 2];

    for (var j = 0; j < count; j += 1) {
  list.push(qrRSBlock(totalCount, dataCount) );
    }
}

return list;
  };

  return _this;
}();

//---------------------------------------------------------------------
// qrBitBuffer
//---------------------------------------------------------------------

var qrBitBuffer = function() {

  var _buffer = new Array();
  var _length = 0;

  var _this = {};

  _this.getBuffer = function() {
return _buffer;
  };

  _this.getAt = function(index) {
var bufIndex = Math.floor(index / 8);
return ( (_buffer[bufIndex] >>> (7 - index % 8) ) & 1) == 1;
  };

  _this.put = function(num, length) {
for (var i = 0; i < length; i += 1) {
    _this.putBit( ( (num >>> (length - i - 1) ) & 1) == 1);
}
  };

  _this.getLengthInBits = function() {
return _length;
  };

  _this.putBit = function(bit) {

var bufIndex = Math.floor(_length / 8);
if (_buffer.length <= bufIndex) {
    _buffer.push(0);
}

if (bit) {
    _buffer[bufIndex] |= (0x80 >>> (_length % 8) );
}

_length += 1;
  };

  return _this;
};

//---------------------------------------------------------------------
// qr8BitByte
//---------------------------------------------------------------------

var qr8BitByte = function(data) {

  var _mode = QRMode.MODE_8BIT_BYTE;
  var _data = data;
  var _parsedData = [];

  var _this = {};


  // Added to support UTF-8 Characters
  for (var i = 0, l = _data.length; i < l; i++) {
var byteArray = [];
var code = _data.charCodeAt(i);

if (code > 0x10000) {
    byteArray[0] = 0xF0 | ((code & 0x1C0000) >>> 18);
    byteArray[1] = 0x80 | ((code & 0x3F000) >>> 12);
    byteArray[2] = 0x80 | ((code & 0xFC0) >>> 6);
    byteArray[3] = 0x80 | (code & 0x3F);
} else if (code > 0x800) {
    byteArray[0] = 0xE0 | ((code & 0xF000) >>> 12);
    byteArray[1] = 0x80 | ((code & 0xFC0) >>> 6);
    byteArray[2] = 0x80 | (code & 0x3F);
} else if (code > 0x80) {
    byteArray[0] = 0xC0 | ((code & 0x7C0) >>> 6);
    byteArray[1] = 0x80 | (code & 0x3F);
} else {
    byteArray[0] = code;
}

      // Fix Unicode corruption bug
      _parsedData.push(byteArray);
  }

  _parsedData = Array.prototype.concat.apply([], _parsedData);

  if (_parsedData.length != _data.length) {
_parsedData.unshift(191);
_parsedData.unshift(187);
_parsedData.unshift(239);
  }

  var _bytes = _parsedData;

  _this.getMode = function() {
return _mode;
  };

  _this.getLength = function(buffer) {
return _bytes.length;
  };

  _this.write = function(buffer) {
for (var i = 0; i < _bytes.length; i += 1) {
    buffer.put(_bytes[i], 8);
}
  };

  return _this;
};

//=====================================================================
// GIF Support etc.
//

//---------------------------------------------------------------------
// byteArrayOutputStream
//---------------------------------------------------------------------

var byteArrayOutputStream = function() {

  var _bytes = new Array();

  var _this = {};

  _this.writeByte = function(b) {
_bytes.push(b & 0xff);
  };

  _this.writeShort = function(i) {
_this.writeByte(i);
_this.writeByte(i >>> 8);
  };

  _this.writeBytes = function(b, off, len) {
off = off || 0;
len = len || b.length;
for (var i = 0; i < len; i += 1) {
    _this.writeByte(b[i + off]);
}
  };

  _this.writeString = function(s) {
for (var i = 0; i < s.length; i += 1) {
    _this.writeByte(s.charCodeAt(i) );
}
  };

  _this.toByteArray = function() {
return _bytes;
  };

  _this.toString = function() {
var s = '';
s += '[';
for (var i = 0; i < _bytes.length; i += 1) {
    if (i > 0) {
  s += ',';
    }
    s += _bytes[i];
}
s += ']';
return s;
  };

  return _this;
};

//---------------------------------------------------------------------
// base64EncodeOutputStream
//---------------------------------------------------------------------

var base64EncodeOutputStream = function() {

  var _buffer = 0;
  var _buflen = 0;
  var _length = 0;
  var _base64 = '';

  var _this = {};

  var writeEncoded = function(b) {
_base64 += String.fromCharCode(encode(b & 0x3f) );
  };

  var encode = function(n) {
if (n < 0) {
    // error.
} else if (n < 26) {
    return 0x41 + n;
} else if (n < 52) {
    return 0x61 + (n - 26);
} else if (n < 62) {
    return 0x30 + (n - 52);
} else if (n == 62) {
    return 0x2b;
} else if (n == 63) {
    return 0x2f;
}
throw new Error('n:' + n);
  };

  _this.writeByte = function(n) {

_buffer = (_buffer << 8) | (n & 0xff);
_buflen += 8;
_length += 1;

while (_buflen >= 6) {
    writeEncoded(_buffer >>> (_buflen - 6) );
    _buflen -= 6;
}
  };

  _this.flush = function() {

if (_buflen > 0) {
    writeEncoded(_buffer << (6 - _buflen) );
    _buffer = 0;
    _buflen = 0;
}

if (_length % 3 != 0) {
    // padding
    var padlen = 3 - _length % 3;
    for (var i = 0; i < padlen; i += 1) {
  _base64 += '=';
    }
}
  };

  _this.toString = function() {
return _base64;
  };

  return _this;
};

//---------------------------------------------------------------------
// base64DecodeInputStream
//---------------------------------------------------------------------

var base64DecodeInputStream = function(str) {

  var _str = str;
  var _pos = 0;
  var _buffer = 0;
  var _buflen = 0;

  var _this = {};

  _this.read = function() {

while (_buflen < 8) {

    if (_pos >= _str.length) {
  if (_buflen == 0) {
      return -1;
  }
  throw new Error('unexpected end of file./' + _buflen);
    }

    var c = _str.charAt(_pos);
    _pos += 1;

    if (c == '=') {
  _buflen = 0;
  return -1;
    } else if (c.match(/^\s$/) ) {
  // ignore if whitespace.
  continue;
    }

    _buffer = (_buffer << 6) | decode(c.charCodeAt(0) );
    _buflen += 6;
}

var n = (_buffer >>> (_buflen - 8) ) & 0xff;
_buflen -= 8;
return n;
  };

  var decode = function(c) {
if (0x41 <= c && c <= 0x5a) {
    return c - 0x41;
} else if (0x61 <= c && c <= 0x7a) {
    return c - 0x61 + 26;
} else if (0x30 <= c && c <= 0x39) {
    return c - 0x30 + 52;
} else if (c == 0x2b) {
    return 62;
} else if (c == 0x2f) {
    return 63;
} else {
    throw new Error('c:' + c);
}
  };

  return _this;
};

//---------------------------------------------------------------------
// gifImage (B/W)
//---------------------------------------------------------------------

var gifImage = function(width, height) {

  var _width = width;
  var _height = height;
  var _data = new Array(width * height);

  var _this = {};

  _this.setPixel = function(x, y, pixel) {
_data[y * _width + x] = pixel;
  };

  _this.write = function(out) {

//---------------------------------
// GIF Signature

out.writeString('GIF87a');

//---------------------------------
// Screen Descriptor

out.writeShort(_width);
out.writeShort(_height);

out.writeByte(0x80); // 2bit
out.writeByte(0);
out.writeByte(0);

//---------------------------------
// Global Color Map

// black
out.writeByte(0x00);
out.writeByte(0x00);
out.writeByte(0x00);

// white
out.writeByte(0xff);
out.writeByte(0xff);
out.writeByte(0xff);

//---------------------------------
// Image Descriptor

out.writeString(',');
out.writeShort(0);
out.writeShort(0);
out.writeShort(_width);
out.writeShort(_height);
out.writeByte(0);

//---------------------------------
// Local Color Map

//---------------------------------
// Raster Data

var lzwMinCodeSize = 2;
var raster = getLZWRaster(lzwMinCodeSize);

out.writeByte(lzwMinCodeSize);

var offset = 0;

while (raster.length - offset > 255) {
    out.writeByte(255);
    out.writeBytes(raster, offset, 255);
    offset += 255;
}

out.writeByte(raster.length - offset);
out.writeBytes(raster, offset, raster.length - offset);
out.writeByte(0x00);

//---------------------------------
// GIF Terminator
out.writeString(';');
  };

  var bitOutputStream = function(out) {

var _out = out;
var _bitLength = 0;
var _bitBuffer = 0;

var _this = {};

_this.write = function(data, length) {

    if ( (data >>> length) != 0) {
  throw new Error('length over');
    }

    while (_bitLength + length >= 8) {
  _out.writeByte(0xff & ( (data << _bitLength) | _bitBuffer) );
  length -= (8 - _bitLength);
  data >>>= (8 - _bitLength);
  _bitBuffer = 0;
  _bitLength = 0;
    }

    _bitBuffer = (data << _bitLength) | _bitBuffer;
    _bitLength = _bitLength + length;
};

_this.flush = function() {
    if (_bitLength > 0) {
  _out.writeByte(_bitBuffer);
    }
};

return _this;
  };

  var getLZWRaster = function(lzwMinCodeSize) {

var clearCode = 1 << lzwMinCodeSize;
var endCode = (1 << lzwMinCodeSize) + 1;
var bitLength = lzwMinCodeSize + 1;

// Setup LZWTable
var table = lzwTable();

for (var i = 0; i < clearCode; i += 1) {
    table.add(String.fromCharCode(i) );
}
table.add(String.fromCharCode(clearCode) );
table.add(String.fromCharCode(endCode) );

var byteOut = byteArrayOutputStream();
var bitOut = bitOutputStream(byteOut);

// clear code
bitOut.write(clearCode, bitLength);

var dataIndex = 0;

var s = String.fromCharCode(_data[dataIndex]);
dataIndex += 1;

while (dataIndex < _data.length) {

    var c = String.fromCharCode(_data[dataIndex]);
    dataIndex += 1;

    if (table.contains(s + c) ) {

  s = s + c;

    } else {

  bitOut.write(table.indexOf(s), bitLength);

  if (table.size() < 0xfff) {

      if (table.size() == (1 << bitLength) ) {
    bitLength += 1;
      }

      table.add(s + c);
  }

  s = c;
    }
}

bitOut.write(table.indexOf(s), bitLength);

// end code
bitOut.write(endCode, bitLength);

bitOut.flush();

return byteOut.toByteArray();
  };

  var lzwTable = function() {

var _map = {};
var _size = 0;

var _this = {};

_this.add = function(key) {
    if (_this.contains(key) ) {
  throw new Error('dup key:' + key);
    }
    _map[key] = _size;
    _size += 1;
};

_this.size = function() {
    return _size;
};

_this.indexOf = function(key) {
    return _map[key];
};

_this.contains = function(key) {
    return typeof _map[key] != 'undefined';
};

return _this;
  };

  return _this;
};

var createImgTag = function(width, height, getPixel, alt) {

  var gif = gifImage(width, height);
  for (var y = 0; y < height; y += 1) {
for (var x = 0; x < width; x += 1) {
    gif.setPixel(x, y, getPixel(x, y) );
}
  }

  var b = byteArrayOutputStream();
  gif.write(b);

  var base64 = base64EncodeOutputStream();
  var bytes = b.toByteArray();
  for (var i = 0; i < bytes.length; i += 1) {
base64.writeByte(bytes[i]);
  }
  base64.flush();

  var img = '';
  img += 'data:image/jpeg;base64,';
  img += base64;

  return img;
};

//---------------------------------------------------------------------
// returns qrcode function.

var drawImg = function(text, options) {
  options = options || {};
  var typeNumber = options.typeNumber || 4;
  var errorCorrectLevel = options.errorCorrectLevel || 'M';
  var size = options.size || 500;

  var qr;

  try {
      qr = qrcode(typeNumber, errorCorrectLevel || 'M');
      qr.addData(text);
      qr.make();
  } catch (e) {
      if(typeNumber >= 40) {
          throw new Error('Text too long to encode');
      } else {
          return drawImg(text, {
              size: size,
              errorCorrectLevel: errorCorrectLevel,
              typeNumber: typeNumber + 1
          });
      }
  }

  // calc cellsize and margin
  var cellsize = parseInt(size / qr.getModuleCount());
  var margin = parseInt((size - qr.getModuleCount() * cellsize) / 2);

  return qr.createImgTag(cellsize, margin, size);
};
module.exports = {
drawImg: drawImg
};